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Optical Absorption of Polymer Films Doped with BEDT-TTF Polyiodides

100%
Helberg H., Staerk D., Ulański J., Jeszka J.
Acta Physica Polonica A
|
1995
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vol. 87
|
issue 4-5
893-897
EN
Conducting reticulate doped polymeric films containing BEDT-TTF io­dide crystalline network were annealed in order to transform the crystallites into crystal phases with metallic conductivity. Measured optical absorption spectra show that annealing shifts the absorption band to higher frequencies and increases the transparency of the films. This behavior corresponds to the transformation of the α-phase into the superconducting α_{t}-phase observed in (BEDT-TTF)_{2}I_{3} single crystals.
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New Insights into the Reentry Behavior of Deuterated DCNQI Cu-Salts by Microwave Measurements

100%
Predak S., Helberg H., Von Schütz J.
Acta Physica Polonica A
|
1995
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vol. 87
|
issue 4-5
791-795
EN
The microwave conductivity of the copper salt of DCNQI (N,N'-Di­cyanoquinodiimine) with two methyl side groups (undeuterated, h_{8}), the fully deuterated salt (d_{8}), the salt with only the methyl groups deuterated and of alloys of undeuterated and deuterated salts was measured. The mi­crowave conductivity (10.2 GHz) qualitatively follows the dc conductivity. The difference is in the window of diminished conductivity between phase transition and reentry, where the microwave conductivity is higher than the dc conductivity. This indicates the existence of a crystal fraction with higher (metallic) conductivity (portion: ≈ 1‰) not seen by dc methods.
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D.C. Conductivity of Polymer Composites with (BEDT-TTF)_{2}I_{3} Superconductor

76%
Ulański J., Jeszka J., Polanowski P., Głowacki I., Kryszewski M., Staerk D., Helberg H.
Acta Physica Polonica A
|
1995
|
vol. 87
|
issue 4-5
899-903
EN
Electrical properties of conducting reticulate doped polymeric films con­taining BEDT-TTF iodide crystalline network were investigated. Conditions of preparation of this kind of films i.e. time of doping by iodine vapours and time and temperature of annealing and their influence on transformation of the BEDT-TTF iodide crystallites into superconducting phase are discussed.
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